Gear-generator.



E. J. LEES. GEAR GENERATOR. APPLICATION 1 .11.21) AUG. 6, 1909 1,071 ,1 63, Patented Aug. 26, 1913.

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E. J. LEES.

GEAR GENERATOR.

. Y APPLICATION FILED we. a, 1909.

1,071,1 63. Patented Aug. 26, 1913.

6 SHEETS-SHEET 2.

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El Jo GEAR GENERATOR. APPLIUATIGH FILED AUG. 8, 1909.

Patented Aug. 2&3, 1918.

2722711 flwesfjles B. J. LEBS. GEAR GENERATOR. 1,0711 63. APPLIOATIQILIILBD we. a, 1909. Patented Aug. 26 1913' 6 SHEETS-SHEET 4.

E. J. LEES.

GEAR GENERATOR.

APPLICATION FILED AUG. 0, 19 09.

Patented Aug". 26, 1913.

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u I w x\\\\\\\\\\\\\\\\ III E. J. LBES. GEAR GENERATOR.

7 APPLICATION FILED AUG. 6, 1909.

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Patented Aug. 26, 1913.

UNITED STATES PATENT OFFICE.

, nmmsr tens, or cr-nvnmnn, onto. assmnoa T0. run LEES-IBRADNER COMPANY, or CLEVELAND, onto, a conronarxou or OHIO.

enamennnmpron.

- following is a specification, the -of the invention being herein explained and the best mode in which I have contemplated Speciflcatiunot Letters ratent: I Patentd A 26 1913 I Application filed August a, 1808. Serial no. 511597.

provement in Gear-Generators, of whichthe principle applying that principle, so as to distinguish it from other inventions.

My invention relates to gear-generating machines, generally referred to in the art as bobbing machines, whereby spur gears, worm gears, and spiral gears are cut by means of a continuously rotating cutter operating upon a continuously rotating blank.

The object of the invention is toprovide a machine of the above named character embodying in its structure a. maximum economy of design with amaximum efliciency of operation, and further adapted to the cut ting of worms in addition to the cutting of gears of the above mentioned character.

The said invention consists of means hereinafter fully described, and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detail certain means embodying my invention, the disclosed means, however, constituting but one of various mechanical forms in which the principle of the invention may be applied.

In said annexed drawings :'Figure 1 is a front elevation of a machine embodying my invention. Fig. 1 is a rear elevation of a fragmentary portion of the machine, illustrating a detail of the construction thereof. Fig. ll is a front elevation of a detailed part of the mechanism. Fig. 2 is an elevation of the right handside of the machine, as illustrated in Fig. 1. Fig. 8 is a plan of the machine. Fig.3 is a plan of a detail of the machine, and Fig. 3 a plan of a segregated element of the parts shown in Fig. 3. Fig. 4; is a horizontal section of the machine taken upon the plane.

indicated by line IV-IV in Fig. 2, certain parts of the machine, however, cut by. this plane being shown in elevation, parts being broken away and certain parts being omit-ted therefrom. Fig. 5 is a vertical section taken upon the plane indicated by line V-V in Fig. 3, certain parts'of themachine being shown in elevation. Fig. 5 is a bottom plan of a detail port-ion of the mechanism shown in Fig. 5. Fig. 6 is a vertical section taken upon the planes indicated by lines VI-VI 1n.F1g. 3. 6 is a side elevation of the partsshown in Fig. 3. Fig. 7 is afvertical section taken upon the planes indicated by lines VII-*VIlin Fig.3. Fig. 8 is a fragmentary vertical section taken upon the plane indicated by line VI--VI, Fig. 3, i1lus+ trating a particular adaptation of the parts therein shown.- Fig. .9 is a vertical fragmentary section, taken upon the plane indicated by line IX-IX, Fig. 3. Fig.'10 is a side elevation of a fragmentary portion of the left hand side of the machine, as-viewed In Fig. 1, showing the arrangement of gears adapted for use in operating the machine with a single cutter, as used in cutting" worms. Fig. 11 1s a side elevation similar to that of Fig. '10, showin the particular'ar-- rangement of gears, use for operating with a compound cutter such as is used in generating spur or spiral gears. Fig. 12 is a section taken upon the plane indicated by lines XlL-XII in Fig. 10, the gears, however, being llustrated in this figure as having axes all located ina single plane, for the the relationship of these gears- Figs. 13 and 14 are fragmentary axl'aljaeetions of the work-rotating spindle, andtak'en upon the planes indicated by lines XIIL-XIII and XIY'XIV, respectively,in'Fig. 15. Fi '15 1s a fragmentaryend elevation of sue work-rotating spindle-f v Referring to the drawingsgthe frame A 15 provided upon its upper surface-with av horizontal slideway 4, Figs. 4, and 7, which is placed at right an Ice witht-he longitu dinal axis of the mac inc, and at the back thereof. Mounted upon this slideway is a tool-head slide B, Figs. 6 and 7 which is formed with a cylindrical seat 5, having, its axis horizontal and parallel with the'dimm tion ofsliding movement of--i h'e -tool-head' slide. Mounted in this horizontal seat is a tool-head B formed atone end with an integral flange b, and at the other end with a removable flange head 6 which is suitably bolted ,to the head and, in conjunction with the flange b, prevents endwise displacement of the head in its seat. One'edge Z of the flange-head is graduated, as shown in Fig. 3, so as to enable the operatorfto determine the angular relationship of the'hea'd with the slide B, as will be readily understood.

The tool-head slide-frame member B in- .purpose of greater clearness' in illustrating i which is formed the seat a transverse slot 1), Figs. 3, 4 and intersects said seat throughout an arc of substantially one hundred and eighty (180) degrees, beginning in a plane. having a positive angle of forty-five (45) degrees wit reference to the horizontal plane, and terminate ing in a plane forming a negative angle of forty-five The said frame member is split at b? b, and suitable bolts b 6 are providedfor drawing the split portions together, bind the tool-head in its seat to assume various fixed angular positions, as will be readily understood. j f

v The flange-head b is provided with a central horizontal bearing b, in which is mounted a horizontal tool-driving spindle B The inner end of this spindle carries a bevel gear b, which meshes with a second bevel gear I), secured to the lower end of a' secondary tool-driving spindle B. This-latter spindle is mounted in a bearing b whose axisis perpendicular to the axis of spindle B as 0nd gear screws, by means of which it may be fixedly shown in Fig. 6, and projects through the slot 1), as shown. The tool-head B is formed with a gear housing,jand in this housing is formed a bearing b in which "the outer end of spindle B is mounted. Within the housing and secured to the said spindle is a.

pinion B, which meshes with, a gear B,.secured to The said ear is of compound form, a sec- 8 being formed on or secured to the hub of same, and of smaller diameter than the main member of gear B; ing support 13 is mounted upon the outer front end of the head, so as to be adjustable .in the direction of the axis of said spindle,-

b", as will be readily housing and adjacent suitable means such as screws 6 whereb it may be readily detached therefrom, as will be readily understood. To the inner end ofspindle B is secured the tool B g-in this instance shown as a single cutter. The pinion B is made of considerably less diameter thanthat of gear B, so as to'permit the spindle B to be rotated at a higher rate of speed than that imparted to spindle 13. Where, however, it is desired to rotate: the cutter at a lower rate of speed than thatderived from the spindle B, as, for-in. stance, when it is desired to generate gears.

b is provided with '6, which,

support B may be; then moved upon its (45) degrees with such plane' in order to a 'main tool-driving spindle B.

A bear-' is an opening I) "adjacent to a B meshing with the gear The lower end of this bearing support.

-This main work-carrying tion to. traveling upon the slide-way a, has

I guide 0 and upon or tail-stock'C by the bobbing method, the bearing support for said spindle isremoved, together with such" spindle and pinion B, the latter being withdrawn through the opening I). The

shdeway and may be then used as a bearlng forthe lower end of a mandrel 13, upon whichthe hobbing tool 13 is mounted, the other endof the mandrel'being driven into spindle B which is provided with a suitable tapered seat vfor such mandrel end, as will be readily understo0d. This latter arrangement is'shown in Fig. 8, and is generally adopted .when a compound cutter or hob is used for generating spur, worm or spiral gears, alower rate of speed being required in this class-of operations than that in which a worm, for instance, iscut by means of a single cutter.

The mechanism as thus far described forms no part of the invention as herein claimed but is separately claimed in an application filed by me Mar. 25, l9l2and bear- "ing Serial No. 685,949.

Formed upon the frame of the machine is a horizontal slideway a, Fig. 6, which is placed at right angles with respect to the direction of movement of the slideway a. v This slideway extends longitudinally of the frame and laterally of each side of a perpendicular plane passing through the axis of the tool-head B, as shown in dotten lines in Fig. 4. The frame 'A is furthermore provided with an upwardly extending portion A, which is "formed. with a vertical and longitudinally extending bearingsurface a". Mounted upon this slideway is a work-carrying slide C, Figs. 1, 2, 3, 5, 6 and 7. llpon th1s slide is mounted Work-carrying and rotating means'which will be hereinafter specifically described, and which includes a rotatable spindle C, Fig. 7, having its axis of rotation parallel with the direction of sliding movement of the slide. As shown, the

slideway and slide are located so that the latter may be caused to pass along in front of the tool-holding and operating head, so as to impart to the work a path of movement such as is required in order to permit the tool to operate upon its entire length. Suitable binding screws 0 and a gib are provided, whereby the slide may be fixedly secured upon the frame when it is desired to give samea fixed position,'Figs. 4 and 6.

slide 0, in addiits upper and forward portion formed with a surface 0 which bears against the surface a of the upwardly extending portion A;

extends parallel th .130 a manner,

nt nice with, and-is engaged by a pinion a mounted upon a horizontal spindle 0*, to whose outer end is fixed a'hand wheel 0'. Formed upon this secondaryiporticn C of the slide,.and i projecting rearwardly, is an extension 0 whose rear end is provided with a bearing having its axis coinciding With the axis of the work-rotating spindle C, It will therefore be seen that by turning'the hand wheel, m the extension C and consequently the bearing, may be adjusted in horizontal planes with respect to the adjacent end ofthe work-rotating spindle C,

The work-blank D is mounted in the usual, upon 1. suitable mandrel, one end of which is secured in the tapered bore 0, Fig. '1, of the spindle C, and whose other end is mounted in the bearing, the latter being adjusted to assume the proper position for receiving the particular mandrel which it is desired to employ at any specific time, When, however, it is desired, for any reason, to merely center the-outer end of the work-blank-carrying mandrel, the cap a, Fig. 6, is removed, and in the semi-cylindrical portion of the bearing so ex used on the extension C is placed a center Figs, 3, 3 and 6 This center consists of the centering portion 0 and a semi-cylindrical ortion c, which is made to fit exactly into he said exposed semi-cylindrical bearing portion, the hat surface of this portion 0 being thus brought flush With-the exposed end of the extension 0. The center C is provided with a smooth bore 0 through which projects the screw 0, by means of which the center'may be fixedly secured to the said extension C This particular feature. of the mechanism is separately described and claimed in an application filed by me Mar. 25, 1912, and bearing Serial No. 685,951. It will therefore be observed that by means of this structure, and when the center is, used, such center and screw roject nearwardly a minimum distance, so t at the operating head and tool may be brought into, close proximity to the slide C, thereby permitting the tool to operate upon work of comparatively small diameter, as will be neadily understood by those skilled in the art. Suitable binding screws 0 are provided for securing the secondary part or tail-stock C to the main slide member C.

By the above described arrangement of ing spindle, it will be observed that the main tool-driving arbor is adjustable about the horizontal axis of adjustment of the toolhead, the work-carrying slide hasa horizontal direction of feeding movement, the rotatable work-driving spindle has its axis of rotation parallel with the direction oi the workholding slide feed movement, and the axis of the said tool-driving arbor is angularly rean latcd to a horizontal plane, the slidew-ay of 1 o the work carrying slide and which passes out without a E, Fig. 6, the rear end of and suitable 'hand-wheeland forming its. outer rim is a ing radially from the ring is a the slideways and the rotatable work-rotat" the work-carrying slide also being horizon t l- Fur hermore, the s ideway for the work-carrying slide is intersected by a plane perpendicular to the direction of movement through the axis of adjustment of the tool m driving arbor. It will therefore be seen that by this arrangement, the work-carrying slide is always support d in the planes con-- taining the. lines of direction of-the greatest stress to which the work is subjected, that is in those vertical planes which intersect the tool and are parallel with or contain the axis of adjustment. By providing the upwardlyextending portion A", and the bearing surfaces c and a, it will be seen that by reason of the latters position above the slide-way a, a further supporting ele-' ment is obtained which makes for increased rigidity of the structure. The work thererore is supported in a very rigid and substantial manner, and the operation is carried giving of the work-supporting parts, and therefore with increased accuracy. s1ghe sliding movement of the tool-head is obtained by means of a feed-screw which is fixedly secured to a downwardly projecting portion b of the slide, the front or threaded end of the screw being engaged by an interiorly Q5 threaded sleeve E. Keyed to this sleeve is a hand-Wheel E", by means of which the said sleeve may be turned. The sleeve is mount ed in a bearing support 0 which forms a part of or is fixedly secured to the frame A, means such as a rear flange 6 and nut e are provided to prevent endwise movement of the sleeve with reference to hearing support a". It will therefore be seen that by turning the hand-wheel the screw may be drawn forward orpushed rearwardly and the corresponding move Inent imparted to the slide B.

Mounted upon the main portion of the ring E Figs. 1, 2, 3 and 6. This ring may be fixedly secured to the main body of the a set screw a Extendrejection a, ter fully dewheel by means of Whose function will be hereina scribed.

Rot-stably mounted on the hub. of the wheel E is a worm-wheel 6*, Fig. 6, which is engaged by a worm portion e fixed to or forming a part of a transverse driving shaft E, Fig. 1. This worm-wheel is provided with a flange e adjacent to the hand-wheel, and this flange may be caused to frictionally engage the latter by means of a ring a, actuated by means of screws 0 By this means, 125 the rotation of the worm wheel may be caused to rotate the hand-wheel, and thereby effect a continuous. feeding movement or such feeding movement may be discontinued by disconnecting the worm-wheel as above 18,0.

the tool-head slide or not. This feature of been removed therefrom, the

with exactness after having disk 6 is loosened from the hub of the hand-wheel and turned so as to register zero, after which it is then secured in place. The ring E having been previously loosened, the rod F is drawn forward by hand so as to permit the dog 'F to be lifted upwardly, whereupon the rod is released and the spring 7 pulling same'backwardly so as to cause the rear face of the collar f to engage said dog, and hold the latter in such upward position by frictional engagement. The ring E is then turned so as to cause the projection e to endescribed, according as it is desired to feed again occupy the mechanism is specifically claimed in a separate application filed by me Mar. 25, 1912, and bearing Serial No. Also mounted u on the hub of the hand-wheel is adisk e",-wiiose circumference is graduated, and which may be secured to or released from the hub by means 0 a thumb-screw '6 By means of a suitable mark upon the adjacent surface e of the bearing support 0 the angular position of the hand-wheel may be determined, as will be readily understood.

described and Mounted upon the side of the frame A gage the upper surface of the front end of and extending from front to rear thereof is the rod, and then secured in that position a reciprocable rod F, Fig. 2. The rear end by set-screw e The-collar F is then loosof this rod is provided with a nut f, and inened, slid backwardly until it engages the termediately of this nut and the frame is a adjacent face of the hanger b, and then coil-spring f This spring normally holds again fastened by means of the set screw f 35 the front end of the rod in its rearmost po- The dog F is thereupon pulled downwardly sition. This front end of the rod is so 10- so as to disengage the collar, the rod F becated thatwhen the rod is drawn forwardly ing, however, still retained in place by the against the action of the spring f, it will collar F The tool-head slide B may roject into the path of rotation of the prothereupon be backed away from the work ection 6 upon the ring E of the handby turning the hand-wheel from right to wheel. Adjacent to this front end of the left, the operator, however, making mental rod and secured thereto is a cylindrical colnote of the number of complete revolutions lar f Figs. 1 and 2, and this collar is in a through which he has turned the wheel. In position such that when the rod is drawn this backward movement, the rod F recedes 5 forward against the action :of the spring, its with the slide until it reaches its rearmost rear face may be engaged by a manuallyposition. The slide, however, may, as will operable dog F, Figs. 1 and 2, such dog bebe readily understood, be moved still faring oscillatorily mounted upon the frame, ther rearwardly, so as to entirely disengage as shown. the collar F Assuming, now, that it is de- In practice, I prefer to make the pitch sired to bring the tool back to exactly the of the feeding screw one-tenth (1/10) of an same position which it previously occupied,

. inch, and the entire circumference o the as is frequently the case in work of this disk 0 is divided into one hundred (100) class, and as will be readily understood by graduations. By turning the hand-wheel those skilled in the art, the hand-wheel is 05, through an are equal to one one-hundredth now turned from left to right and the slide (1/100) of its circumference, or one gradufed forwardly from the rear toward the ation, the tool-head slide will therefore be front. During this forward movement, it fed one one-thousandth (1/1000) of an re e'ngages the collar F and immediately inch. The thickness of the collar is made following such engagement, the rod again 1 such that when the. rod is drawn forward so moves forwardly until its front end again as to cause t e rear face of such collar to be begins to intersect the path of the projecengaged by the dog F, the front end of the tion 6 By reason of the factthat the exrod will extend into the path of the protent of such projection is made as above dejection e one-tenth (1/10) of an inch. scribed, one-tenth of an inch, and one com- Upon the rod F and intermediately of the plete revolution of the hand-wheel will ends of same, is mounted a sliding collar F move the slide, and therefore the rod, one- Fig. 2, which may be fixedly secured in any tenth of an inch, such intersection does not desired position there-along, by means of a begin until just after the hand-wheel, and suitable set screw f Depending from the therefore the projection 6 has completed slide B is a hanger 15 whose lower end is the next to the last revolution which is necformed with a bore through which the rod essary to bring the slide and tool back to the F extends. The above described rod and required position. By the time, therefore, the attending parts constitute means for authat the last revolution is completed, the end I tomatically stopping thetool-head slide sucof the rod will again be intersecting the cessively at the same point, and for the purpath of the projection, and the said wheel pose of producing this result, the said parts will therefore be stopped in exactly the poare manipulated in the following manner. sition which it left at the beginning of-the Assuming now that the slide- B has been operation. given the position which it is desired it shall The shaft E is mounted in a hearing A which is pivotally mounted upon a suitable journal a as shown in Fig. 1. This shaft may therefore-be; oscillated so as to disengage the worm e,

. mally in compression and whose upper end forms a; bearing for which carries a tially arranged clutch pins bears against the lower side of a bearing A. This latter bearing is pivotally mounted upon the frame upon-a journal pin a secured to the frame A, and its outer end the said right hand end of the shaft E. The upper surface of this pivotal bearing is engaged by the dog E. The direct engagement between the dog and the bearing is elfected by a lug a formed on the dog, which is provided with a stepped notch 6 having one portion of greater depth than the other, as shown in Fig. I. This notch receives the hearing A and the deeper portion thereof perm-its such bearing to rise, by the action of the spring e, a distance sufficient to permit the worm to disengage the worm-wheel. When it is desired to cause the worm to engage the worm-wheel, the outer end of the bearing is d ressedand the dog E swung over to the le h t so as to permit the portion of the notch of less depth to engage same and hold it in such depressed position. A reversal of this operation is edected by merely swinging the dog to the right, as will be readily understood.

The shaft E" is driven by means of a cone pulley E", Fig. 4, which may be connected by means of a suitable belt with a second pulley E driven as will be hereinafter more fully described. 7

l shall now proceed to describe what I shall hereinafter designate as the main driving means of the machine. This means includes primarily a cone-pulley G, Fig. i, which is loosely and rotatably mounted upon a main driving shaft G. In the interior of this pulley and fixed to shaft G is a disk plurality of circumferen- These pins are adapted to engage a plurality of similar pins 9 secured'upon a web forming a part of the pulle and of a sleeve Gfimounted upon the sha t G, slidable thereon in the direction of its axis, and rotatable therewith. The one end of this sleeve projects beyond the pulley as shown in Fig. 4-, and is formed with a groove g This groove is engaged by the forked upper end of a bell crank lever H, Figs. 4 and 1. This lever is oscillatorily mounted upon the frame, and

as will has a horizontal arm h forming a handle for manual operation.- The upper surface of this handle is engaged by a plunger H mounted in a suitable housing A formin a part-of, or fixed to the frame. This housm contains a coil-spring h which tends to move the plunger downwardly against the handle. This tendency is bya in h fixed to an arm h, Fig. 5, which is fixe ly mounted upon frame. The handle is provided with a lug h, which normally rests upon lug h, as shownin Figs. 5 and 1.

The parts above described are so arranged that.when the clutch pins 9 and g are in normally resisted a rock shaft H. mounted in suitable bearings upon the engagement with each other, the sleeve G will be placed so as to impart to the handle it a position wherein the lug k may rest upon the lug k Coil-springs a and a are mounted upon a pin or. which is secured to the frame and passes through a suitable aperture a inthe arm l2. the springs hearing upon opposite sides of the latter. These springs tend to maintain the arm 5 in a a normal position in which the lug k caused to engage the lug h, Fig. 1. oscillation of the rock-shaft H in either direction will cause the lug it? to disengage the lug h thereby permitting the plunger to act and throw the handle it downwardly. This action will result in carrying thesleeve G over so as to disengage the clutch pins 9' and g and thereby disconnect the shaft 8" from the pulley G. shaft Gr which meshes with may be as shown in is secured a bevel gear G Fig. 4s, a bevel gear B which is fixedly secured to the sleeve 13 mounted 1 in suitable hearings on the main frame, and rotatably and slidably connected by a spline and groove connection with the spindle B, as shown in Fig. 6. I

The oscillatory movement of the rock shaft H is obtained through the instrumentaiity of an arm H mounted upon its front end, as shown in Fig. 5. The upper end of this armis forked and embraces a rod" A, Figs. 1, 4, and 5. This rod is fixed to a hanger C fixed to the work-holding slide, as shown in Fig. l, and upon this rod are adjustably fixed two collars a a". These collars may be set upon the rod so as to engage the arm H during the-sliding movement of said work'supportin'g and rotating slide C, as will be readily understood. It will therefore be seen that the main driving mechanism may be connected or disconnectedat times corresponding with predetermined positions occupied by the workholding and rotating slide.

Forming an element of the main driving 'mechanism is a inion G fixedly secured to the shaft G. his pinion engages a gearwheel G formed with a hub 3 which is It will therefore be seen that the Upon one end of the end of the countershaft is secured a P1111011 hub by aspline and rotatin driving shaft suitable bearings formed .which itself forms a part of the frame of so I therefrom and movably adjustable in a direction transverse mounted in a' suitable bearing a. forming a part of the main frame. This hub is provided with a bore in which is slidably mounted a countershaft G, rotatably fixed to the groove connection, as will readily be understood. This countershaft has its outer end mounted in a hearing a" formed upon an extension 0 forming a part of the frame of the work-carrying and rotating slide C. Upon the outer 1 which is connected with a main work-rotating shaft G by a chain of gears, 2, 3, 4, and 5, gears 2, 3 and 4, being mounted in a slot 0 upon a swinging arm a angularly adjustable upon the work-holding slide frame, as shown in Figs. 3, 4 5 and 11. This arm is formed with a slot 0 which, in connection with a cap screw 11 permits the arm to be secured in any desired angular position, as will be readily understood.

Upon the inner end of the main work- C is fixedly secured a spira gear. 0 .Figsro and 9, this gear engaging with a second spiral gear fixedly secured to the lower end of a vertical spindle C. This latter spindle is mounted in in a housing C the work-holding slide, but is made separate with respect to the directlion of slide-feed movement, as shown in 5. The said housing is provided with slots 0 0 through which pass cap screws 0", by means of which the housing maybe fixed to the main frame of the slide, as will be readily understood.

Intermediately of the ends of the spina; dle C is secured a worm C", which engages slide-frame and into an a worm-wheel (1 fixed to the work-rotating spindle C, as shown in Figs. 4 and 7. This worm-wheel forms one element of a compound gear, the other element of which consists of a spur-gear C Figs. 7 and 9. Slidably mounted upon the shaft C, Fig. 9, is

' which, when the by means of a pin 0 adjacent portion of the aperture formed in the pinion, as-shown. The relationship of the spur-gear member C with the pinion c is such that the latter, by. removing the pin a, may be slid into engagement with the former. It will therefore be seen that the work-holding spindle may be driven by the shaft G either through the medium of the worm-wheel and worm, or through the medium of the pinion and spur-gear. In the latter case, the housing C is slid over so as to disengage the worm from the wormwneel, as will be readily understood. 111 order, however, to prevent any unpremeditated attempt, through carelessness, to drive the in a fixed position passing through an pinion simultaneously through the medium 4 of both sets of driving mechanisms, which would result in a breakage of parts, the housing is provided with a lug 0 Fig. 5*, which, when the worm is in engagement with the worm-wheel, rojects into the path of sliding movement 0 by preventing the latter from being placed into engagement with the spur-gear C until such time as the worm is disengaged from the worm-wheel b sliding the housing in the manner previous described.

When it is desired to drive the work-holding and rotating spindle by means of the inion and spur-gear, and the former is slid into engagement with the latter, the said pinion is rotatably secured to the shaft C by means of the pin 0 previously removed. This pin, after the pinion has been given its correct meshing position, is passed through a transverse bore 0 formed in the pinions body, which registers, under these conditions, with a transverse hole a, formed in the shaft C, as shown in dotted lines, Fig.

-9. This particular feature of the invention will be specifically described and claimed in a separate application which I shall file.

Fixedly secured to the outer end of the work-holdi and rotating spindle C is a pinion J, Fig. 4, which engages a spur-gear J, which is rotatably fixed to a s indle J mounted in a manner hereinafter escribed. To the inner end of this spindle is fixedly secured a clutch-member j which is adapted.

to engage a complementaryclutch-member 9' formed upon the adjacent face of the gear J. The opposite side of the latter gear is formed with a hub 7' provided with an external thread which is engaged by a threaded cap j provided with suitable handles i The outer face of this cap is adapted to abut the slide be seen that by means of the above described arrangement, the rotation of the cap may be caused to throw the clutch-member jinto or out of engagement with its complementary clutch-member on the gear, whereby the spindle J 2 may be placed into operative or inoperative relation with the spindle C. The outer end of the spindle J *is extended so that it may receive both the pulley E and the pinion 6, Fig. 11, the said pulley being provided only on such occasions where it is desired to feed the tool-holding and operating slide automatically, as will be readily understood by those skilled in the art. The pinion 6 meshes with a gear 7, which is rethe pinion c flthereframe. It will therefore movably mounted upon a swinging arm 0 le means are provided for fixing said arms in various angular positions. It will is provided other gears which are of a character such therefore be seen that whenthe clutch members j and j are in engagement, the rotation of'the spindle C will eifect the rotation of the feed-screw-C. This latter screw ismounted in the frame of the slide C, as shown in Fig. 7, of endwise movement. The inner or threaded portion of the screw engages a sultable nut C fixed to the main frame A. The rotation of this screw will therefore eflect a sliding movement on the part of the workholding and rotating slide.

The arrangement of gears just described when it is desired to cut spur 0r as will permit one single cut to complete feeding movement of the slide is the cutting operation. When it is desired to feed the slide C by hand, as is frequently required for adjustment'of other purposes, the clutch members 7' and j are disengaged and a suitable handle is aplied to the end of the screw 0, thei'latter ing squared for this purpose, whereby such hand-feed movement "may be readily obtained. It will be noted that the handeffected without rotating the work'-blank.-

Where it is desired to utilize the machine for cutting-worms or other gears in which a single cutter is uM, and the operation is performed in several cuts by a'number of passes of the tool over the work-blank, a different arrangement of 10. In the case of worms or the like, it is necessary in this feeding der to preserve the proper relationship of ect the rotating v timed relation;

= .with the feed movement thereof, and the: gears illustrated in Fig. 10 are arranged to; effect such simultaneous operation. To this T is introduced, comprising a pinion 10, fixed to the shaft the Work and the tool, to eff movement of the work in end, a separate set of gears G, and meshing with a gear 11 mounted upon, the swinging, arm 0", thelatter being adjusted to correspond with. the changed diameters of the gears, being arranged so as to permit of the required placing of the gears thereon. R0-

v thereto a pinion 14,

other gear 15. This tatably fixed to th'efgear 11' is a pinion which meshes with a gear 13, having fixed which meshes with anpinion 16, fixed thereto, and this latter pinion is capable of being connected with 'or disconnected from the gear15 by means of a nut 17 The pinion 16 meshes with a gear 18 having'lixe thereto a pinion 19 meshing with a gear 20, thelatter mounted upon arm" 0 and engaging a pinion 21 fixed to the feed-screw C. It will therefore be obthe previously described arrangementof the and so as to be incapable the Work and seen that the ring may gears .is provided, this arrangement being illustrated in Fig.-

movement, in orvided with a-tooth 0 adapted and the slot therein 7 latter gear also has a 1 served that therotation of the feed-screw C is effected directly from the shaft G instead of indirectly therewith through the work-holding and rotating spindle C, as in is desired to rotate the feed-sciew G" manually, the pinion 1-6 is disconnected in the manner previously described, the handle applied to said screw, the latter thereby rotated without interference, the pinion 16 rotating idly uponits bearing. i V

The work-rotating spindle C consists mainly of an outer hollow s gears. When it indie o Fig.

7, and an inner spindle U, capable of :3

rotation, as will be hereinafter described, withinthe outer spindle. The inner spindle is provided, as previously described, with a taper bore e like, as will'be readily understood. The inner end of the inner spindle C is formed or provided with a toothed flange Figs. 13, 14 and 15, and adjacent to this flange and mounted upona bearing upon the outer-spindle C isa ri This ring is provided'with slots 0 through which a pass capscrews a threaded into a flange 0 formed upon the outer end of the outer spindle C. I It will therefore be leased from the outer spindle. a is provided with a depression 0" in which .is seateda cam c fixed to a stem 0" mounted-in the ring as, as shown in Figs. 13 and 15. The outer end oflthe pin is squared so that it may be rotated by means of a wrench.' This construction therefore permits the ring to be adjustedrotatably by any small fraction of an are, as Will be understood. Upon the outer face of the ring is formed a'slotted lug c, in which is seated a removable dog a, one slot 0* being formed so as to pass transversely with relation to the spindles axis, and the other slot 0" being made parallel thereto. The dog 0 which is seated in the slot 0 and is proto engage any one of the notches formed by the teeth on the outer end of the inner spindle. This dog is mounted upon a screw a seated in the slot 0, by means of dog may be secured in its seat.

The number of notches provided in the flange a may be any number required, but is usually ber. When, during the operation, it is desired to change the position of the inner spindle, and therefore. the position of the work rotatablywith:reference to the outer spindle, the ftf.;9;. is loosened and lifted out of engagement with the notches. The i inner spindle may then be rotated throughout any desired angle, as willbe readily understood, and then re-secured to the outer which the for receiving amandrelor the a formed be secured to or re- $5 The flange which is made forty-eight (4-8) in num-" loosened, and the cam rotate thering a bination of a suitable spindleby ever, it is the pitch in engagement'with the particular notch-an means of said dog.. When, howposition of the inner spindle with reference to the outer spindle by an are smaller than of the notches, "the dogof? is left the cap-i screws -0 0 rotated so as to which it. v is secured,

Having fully described my invention, what .I claim therefore and desire to secure by Letters Patent .is:-v a i v.

1. In a gear-generating machine, the comarbor mounted u able about an axls angularly'related to'its own axis; said frame ing a direction-of feed-movement trans erse with respect to the axis about which said arslide-way; a work-carrying slide; mountedupon said slide-way'and engagingsaid aux,- iliary bearing-surface; a tool-drlvmg arbor mounted upon the frame and adjustable about an axis right-angularlyrelated to the direction of sliding movement of said Workcarrying slide; the slide-way for the workcarrying slide and the ,afore-named exten-,-

sion being intersected bya plane which is perpendicular to the direction of.slide-movement, and which passes through the axis about which said tool-driving arbor adjustable.

3. In a gear-generating machine, the combination of a suitable frame with each other; a tool-headslide mounted upon one of said slide-ways; a work-holding slide mounted upon the other of said'slideways, said frame being furthermore pro vided-with an upwardly-extending, portion I bearing surface parallel.

having a vertical with the last-named slide-way; said workfound desirable to change :the'

and therefore the:. inne'r spindle, throughthedesired are." This specific feature :of the,.mechanism is-isep'arrately described and claimed'in:an;;application filed by me Mar. 25, 1912, and bearing Serial-No..685,952. 1

frame; a tool-driving. on the latter and-adjust formed with .a main vslide-way; and a .work-carrying member slidably mounted upon said frame and-havoperative or inoperative;

and running parallel with the lat-v formed with two horizontal slide-ways at right angles holding slide being provided with a secondary horizontal slide-way parallel with said second-named slide-way, and a tail-stock portion adjustably mounted upon said slideway; a'work-rotating member mounted upon said work-holding slide; means for rotating .said work-rotating member and automatically feeding said work-holding slide; main driving mechanism connected with said rotating and feeding means; a tool-head mounted in said tool-head slide and adjustable about a horizontal axis; and right-angularly related with relation to the direction of feed-movement of said work-holding slide; a tool-driving arbor mounted on said tool-head; and means for driving said arbor connected with said main-driving mecha msm. v

In a gear-generating machine, the combination of a suitable frame; a ing slide mounted upon the latter; work- 'rotating means on said slide; main driving means connected with said work-rotating means; slide-feeding means; an auxiliary spindle connected with said work-rotating means; a clutch for rendering said spindle adjustable arms mounted upon said frame, and gears mounted upon said arms, connecting the main driving means with said work-rotating means and with said feeding means; one 0 said arms being adjustable in a manner suc that a gear may be mounted thereon so as to work-carryconnect said spindle and said feeding means.

- 5. In a gear-generating machine, the combination of a suitable frame; a tool-head and rotatable tool-driving arbor mounted thereon, said head being slidably mounted upon said frame; a work-carrying slide mounted upon the latter and having a direction .of movement right-angularly related to that of said head; work-rotating means mounte upon said slide; main driving means connected With said arbor and said work-r0- tating means; means for automatically feeding said slide and connected with said main driving means; said work-rotating means including a spur-wheel and pinion meshing therewith, and a worm and wheel, said pinion and worm mounted upon a common support arranged to be moved so as to'render either said spur and pinion, or said worm and wheel, operative.

Signed by me, this 3rd day of August,

7 ERNEST J. LEES. Attested by,-

'WINIFRED WAL'rz, CURT B. MUELLER. 

